.b_top{
    width: 100%;
    height: 40px;
    display: flex;
}
.b_top span{
    width: 100px;
    height: 40px;
    line-height: 40px;
    text-align: center;
}
.b_top input {
    width: 200px;
    height: 35px;
    margin-top: 3px;
}
.b_button{
    width: 100%;
    height: 40px;

}
.b_button button{
    float: right;
    background: #40a9ff;
    color: white;
    margin-top: 3px;
}